scholarly journals Surface Simplification of 3D Animation Models Using Robust Homogeneous Coordinate Transformation

2014 ◽  
Vol 2014 ◽  
pp. 1-14 ◽  
Author(s):  
Juin-Ling Tseng
Keyword(s):  
Coordinate Transformation ◽  
Computational Cost ◽  
3D Models ◽  
3D Animation ◽  
Storage Cost ◽  
Error Metrics ◽  
Surface Simplification ◽  
Quadric Error Metrics ◽  
Mean Square Errors ◽  
High Storage

The goal of 3D surface simplification is to reduce the storage cost of 3D models. A 3D animation model typically consists of several 3D models. Therefore, to ensure that animation models are realistic, numerous triangles are often required. However, animation models that have a high storage cost have a substantial computational cost. Hence, surface simplification methods are adopted to reduce the number of triangles and computational cost of 3D models. Quadric error metrics (QEM) has recently been identified as one of the most effective methods for simplifying static models. To simplify animation models by using QEM, Mohr and Gleicher summed the QEM of all frames. However, homogeneous coordinate problems cannot be considered completely by using QEM. To resolve this problem, this paper proposes a robust homogeneous coordinate transformation that improves the animation simplification method proposed by Mohr and Gleicher. In this study, the root mean square errors of the proposed method were compared with those of the method proposed by Mohr and Gleicher, and the experimental results indicated that the proposed approach can preserve more contour features than Mohr’s method can at the same simplification ratio.

scholarly journals An Improved Surface Simplification Method for Facial Expression Animation Based on Homogeneous Coordinate Transformation Matrix and Maximum Shape Operator

2016 ◽  
Vol 2016 ◽  
pp. 1-14 ◽  
Author(s):  
Juin-Ling Tseng
Keyword(s):  
Facial Expression ◽  
Coordinate System ◽  
Coordinate Transformation ◽  
Local Coordinate System ◽  
Facial Animation ◽  
Shape Operator ◽  
Transformation Matrix ◽  
3D Animation ◽  
Surface Simplification ◽  
Expression Animation

Facial animation is one of the most popular 3D animation topics researched in recent years. However, when using facial animation, a 3D facial animation model has to be stored. This 3D facial animation model requires many triangles to accurately describe and demonstrate facial expression animation because the face often presents a number of different expressions. Consequently, the costs associated with facial animation have increased rapidly. In an effort to reduce storage costs, researchers have sought to simplify 3D animation models using techniques such as Deformation Sensitive Decimation and Feature Edge Quadric. The studies conducted have examined the problems in the homogeneity of the local coordinate system between different expression models and in the retainment of simplified model characteristics. This paper proposes a method that applies Homogeneous Coordinate Transformation Matrix to solve the problem of homogeneity of the local coordinate system and Maximum Shape Operator to detect shape changes in facial animation so as to properly preserve the features of facial expressions. Further, root mean square error and perceived quality error are used to compare the errors generated by different simplification methods in experiments. Experimental results show that, compared with Deformation Sensitive Decimation and Feature Edge Quadric, our method can not only reduce the errors caused by simplification of facial animation, but also retain more facial features.

3D Simulation of Surface Casing Cementing: Dispersion Effects

2021 ◽  
Author(s):  
Ruizi Zhang ◽  
Ian Frigaard
Keyword(s):  
Computational Cost ◽  
3D Models ◽  
Interface Shape ◽  
3D Simulations ◽  
Numerical Studies ◽  
Dispersion Effects ◽  
Annular Gap ◽  
Primary Cementing ◽  
Other Regarding ◽  
2D And 3D

Abstract Many numerical studies have been conducted regarding laminar miscible displacement flow in narrow, vertical, eccentric annuli. For the next decade it is likely that primary cementing flows on the scale of the well will continue to be simulated predominantly with 2D gap-averaged (2DGA) models. However, 3D simulations are less common due to the computational cost. The comparison between 2D and 3D models needs further attention, to understand the main discrepancies and thus help to understand primary cementing flows better. In this paper, comparisons of 3D against 2DGA model results show a range of interesting different phenomena, e.g. static layers, dispersive spikes, and instabilities. The predictions of the 2DGA model are the same as the 3D results to a degree. In particular, they are consistent with each other regarding the evolving process, interface shape, etc. However, the main difference with the 2DGA concentration arises from dispersion on the scale of the annular gap. From the recent research of Renteria and Frigaard (J. Fluid Mech., vol. 905, 2020) [1], a variety of dispersive effects are the main discrepancy between experiments and 2DGA results as well. We give representative examples of these flows in surface casing geometries and suggest methods for improvement of the 2DGA model.

scholarly journals Pengendalian Safety Stock Guna meminimalkan Biaya Penyimpanan melalui Pendekatan Sistem Kanban Sebagai Pendukung Sistem Produksi just in Time

2010 ◽  
Vol 3 (2) ◽  
pp. 104
Author(s):  
Umar Wiwi, Eti Kristinawati
Keyword(s):  
Cost Reduction ◽  
Raw Material ◽  
Just In Time ◽  
Water Pump ◽  
Total Cost ◽  
Storage Cost ◽  
Maximum Profit ◽  
Kanban System ◽  
Type Water ◽  
High Storage

Based on ultimate goal of each company in gaining maximum profit with minimum total cost then one of alternative should be done in achieving this goal is avoiding excessive raw material stock resulting in high storage cost. The object of this research is CV. Pabrik Mesin Guntur Malang,an industrial water pumpcompany which is having difficulty in controlling raw material stock so that it often experiences abundant stocks.So,the problem is how to make stock controli n order to reduce stocks a mount that will result in storage cost reduction. Production S ystem Just in Time applying Karban system, that has been being implemented this far by Toyota Motor Corporation, Japan, is proposed to be implemented in that company as well in order to reduce prevailing inefficiency result from this existing problem. By applying Kanban system as support for the Production System Just in Time, it is shown that the system is capable in reducing stocka mount by 77.56%f or GTR type water pump and 89.59% for GTO type water pump. While reductions of storage cost achieved are78.99% for GTR type water pump and 90.45% for GTO tlpe water pump

Automatic Cage Building with Quadric Error Metrics

2011 ◽  
Vol 26 (3) ◽  
pp. 538-547 ◽  
Author(s):  
Zheng-Jie Deng ◽  
Xiao-Nan Luo ◽  
Xiao-Ping Miao
Keyword(s):  
Error Metrics ◽  
Quadric Error Metrics

A Component-Wise Approach to Analyse a Composite Launcher Structure Subjected to Loading Factor

2016 ◽  
Author(s):  
Tommaso Cavallo ◽  
Alfonso Pagani ◽  
Enrico Zappino ◽  
Erasmo Carrera
Keyword(s):  
Composite Structures ◽  
Computational Cost ◽  
Free Vibration Analysis ◽  
High Strength ◽  
3D Models ◽  
Advanced Materials ◽  
Space Structures ◽  
One Dimensional ◽  
Computational Costs ◽  
The One

The space structures are realized by combining skin and reinforced components, such as longitudinal reinforcements called stringers and transversal reinforcements called ribs. These reinforced structures allow two main design requirements to be satisfied, the former is the light weight and the latter is a high strength. Solid models (3D) are widely used in the Finite Element Method (FEM) to analyse space structures because they have a high accuracy, in contrast they also have a high number of degrees of freedoms (DOFs) and huge computational costs. For these reasons the one-dimensional models (1D) are gaining success as alternative to 3D models. Classical models, such as Euler-Bernoulli or Timoshenko beam theories, allow the computational cost to be reduced but they are limited by their assumptions. Different refined models have been proposed to overcome these limitations and to extend the use of 1D models to the analysis of complex geometries or advanced materials. In this work very complex space structures are analyzed using 1D model based on the Carrera Unified Formulation (CUF). The free-vibration analysis of isotropic and composite structures are shown. The effects of the loading factor on the natural frequencies of an outline of launcher similar to the Arian V have been investigated. The results highlight the capability of the present refined one-dimensional model to reduce the computational costs without reducing the accuracy of the analysis.

Sign in / Sign up

Export Citation Format

Share Document